Meltem Türkyılmaz , Fatmagül Hamzaoğlu , Mehmet Özkan
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引用次数: 0
Abstract
In this study, pomegranate juice (PJ) was treated with “tannase+lactonase [human-derived (H-PON-1) or rabbit-derived (R-PON-1)]” or “protease [aspartic protease (AP) or cysteine protease (CP)].” After treatment, effects of tannins, proteins and amino acids on sediment formation were determined during storage at 20℃. Among proteins, prolamin showed the highest effect in PJ treated with “tannase+H-PON-1/R-PON-1” and CP. While amino acids did not affect sediment formation in “tannase+H-PON-1/R-PON-1” or AP treatments, only glycine increased sediment content in CP treatment. Removal of galloyl and/or HHDP groups from HHDP-galloyl-glucose-isomer, pedunculagin-2 and punigluconin by “tannase+H-PON-1/R-PON-1” was very effective in preventing sediment formation. Prolamin:galloyl glucose isomer ratio and HHDP-galloyl-hexoside-2 and HHDP-galloyl-glucuronide contents should be 23.244±1.162 and, 1.254±0.063 and 0.679±0.034 mg/L to prevent sediment, respectively. Since common parameters preventing sediment formation in both methods that target removal of tannins and/or proteins were punigluconin content and prolamin:punicalagin-2 ratio, these two parameters must also be considered in sediment-free PJ production.
期刊介绍:
Official Journal of the European Federation of Chemical Engineering:
Part C
FBP aims to be the principal international journal for publication of high quality, original papers in the branches of engineering and science dedicated to the safe processing of biological products. It is the only journal to exploit the synergy between biotechnology, bioprocessing and food engineering.
Papers showing how research results can be used in engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in equipment or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of food and bioproducts processing.
The journal has a strong emphasis on the interface between engineering and food or bioproducts. Papers that are not likely to be published are those:
• Primarily concerned with food formulation
• That use experimental design techniques to obtain response surfaces but gain little insight from them
• That are empirical and ignore established mechanistic models, e.g., empirical drying curves
• That are primarily concerned about sensory evaluation and colour
• Concern the extraction, encapsulation and/or antioxidant activity of a specific biological material without providing insight that could be applied to a similar but different material,
• Containing only chemical analyses of biological materials.